diff --git a/setup.py b/setup.py
index ab0c0b8e..9a9b7f5e 100644
--- a/setup.py
+++ b/setup.py
@@ -34,6 +34,7 @@ def get_packages(package):
 
 setup(
     name='starlette',
+    python_requires='>=3.6',
     version=get_version('starlette'),
     url='https://github.com/encode/starlette',
     license='BSD',